Republican presidential candidates, from left, former Utah Gov. Jon Huntsman, businessman Herman Cain, Rep. Michele Bachmann, R-Minn., former Massachusetts Gov. Mitt Romney, Texas Gov. Rick Perry, Rep. Ron Paul, R-Texas, former House Speaker Newt Gingrich and former Pennsylvania Sen. Rick Santorum participate in a debate Monday, Sept. 12, 2011, in Tampa, Fla. (AP Photo/Mike Carlson)